IBM Personal System 2 Product Reference Ver 4.0 (September 1988)
Appearance
IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0, September 1988. Authoritative submodel and configuration reference for all PS/2 models through 1988.
Download the IBM Personal System 2 Product Reference Ver 4.0 (September 1988) here: File:IBM Personal System 2 Product Reference Ver 4.0.pdf